Quantcast VFR to CFR audio sync issues? - digitalFAQ Forum
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11-29-2020, 09:05 AM
johnny5ive johnny5ive is offline
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Hi All, I'm using the Elgato Video Capture Card to rip some old VHS tapes from a VCR to my Computer. The files that I rip are Variable Frame Rate and I guess that doesn't play nice with Adobe Premiere. Below is the medianfo from a rip

Code:
General
Complete name                            : 1990.mp4
Format                                   : MPEG-4
Codec ID                                 : M4V  (M4V /M4A /mp42/isom)
File size                                : 2.07 GiB
Duration                                 : 1 h 59 min
Overall bit rate                         : 2 473 kb/s
Movie name                               : 1990
Recorded date                            : 2020-11-28
Encoded date                             : UTC 2020-11-28 15:18:56
Tagged date                              : UTC 2020-11-28 15:18:56
Cover                                    : Yes

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L3.1
Format settings                          : CABAC / 3 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 3 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 1 h 59 min
Bit rate                                 : 2 243 kb/s
Width                                    : 720 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Variable
Frame rate                               : 29.864 FPS
Minimum frame rate                       : 2.607 FPS
Maximum frame rate                       : 29 970.000 FPS
Original frame rate                      : 29.970 (30000/1001) FPS
Standard                                 : NTSC
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.217
Stream size                              : 1.88 GiB (91%)
Language                                 : English
Encoded date                             : UTC 2020-11-28 15:18:56
Tagged date                              : UTC 2020-11-28 15:18:56
Color range                              : Limited
Color primaries                          : BT.601 NTSC
Transfer characteristics                 : BT.601
Matrix coefficients                      : BT.601
Codec configuration box                  : avcC

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : mp4a-40-2
Duration                                 : 1 h 59 min
Source duration                          : 1 h 59 min
Bit rate mode                            : Constant
Bit rate                                 : 216 kb/s
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Stream size                              : 190 MiB (9%)
Source stream size                       : 190 MiB (9%)
Language                                 : English
Encoded date                             : UTC 2020-11-28 15:18:56
Tagged date                              : UTC 2020-11-28 15:18:56
mdhd_Duration                            : 7195948
I've tried using Handbrake to convert the files to Constant Frame Rate so I can trim them inside of Adobe Premiere, but whenever I convert the files and check "constant frame rate" the audio is out of sync. Here's an example of a converted file's media info:

Code:
General
Unique ID                                : 195805232622686149486813453214458355601 (0x934EB750DC219B53679CB94AFA289F91)
Complete name                            : source.mkv
Format                                   : Matroska
Format version                           : Version 4
File size                                : 1.32 GiB
Duration                                 : 1 h 59 min
Overall bit rate                         : 1 574 kb/s
Movie name                               : 1990
Released date                            : 2020-11-28
Encoded date                             : UTC 2020-11-29 13:58:51
Writing application                      : HandBrake 1.3.3 2020061300
Writing library                          : Lavf58.29.100
ErrorDetectionType                       : Per level 1

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : Main@L4
Format settings                          : CABAC / 4 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 4 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 1 h 59 min
Width                                    : 720 pixels
Height                                   : 480 pixels
Display aspect ratio                     : 4:3
Frame rate mode                          : Constant
Frame rate                               : 29.864 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Writing library                          : x264 core 157 r2935 545de2f
Encoding settings                        : cabac=1 / ref=2 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=6 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=300 / keyint_min=30 / scenecut=40 / intra_refresh=0 / rc_lookahead=30 / rc=crf / mbtree=1 / crf=22.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=20000 / vbv_bufsize=25000 / crf_max=0.0 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00
Default                                  : Yes
Forced                                   : No
Color range                              : Limited
Color primaries                          : BT.601 NTSC
Transfer characteristics                 : BT.601
Matrix coefficients                      : BT.601

Audio
ID                                       : 2
Format                                   : AAC LC
Format/Info                              : Advanced Audio Codec Low Complexity
Codec ID                                 : A_AAC-2
Duration                                 : 1 h 59 min
Channel(s)                               : 2 channels
Channel layout                           : L R
Sampling rate                            : 48.0 kHz
Frame rate                               : 46.875 FPS (1024 SPF)
Compression mode                         : Lossy
Delay relative to video                  : 85 ms
Title                                    : Stereo
Language                                 : English
Default                                  : Yes
Forced                                   : No
My end goal is to have a file type that I can trim/cut/export (preferably in Adobe Premiere Rush/Pro) and keep the video/audio in sync.

- Are there settings I'm missing originally to export in Constant Frame Rate? Is that possible?
- What am I doing wrong in Handbrake to convert the files to CFR and have the audio in sync?
- I've been reading that Adobe can't handle VFR files so I guess there's no way to do it that way and I need to convert to CFR, is that correct?

Thanks in advance. I'm trying to rip a bunch of VHS home movies for an xmas gift and can't get it right. Thanks!!
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  #2  
11-29-2020, 10:44 PM
Hushpower Hushpower is offline
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What software are you using to capture from the Elgato? Virtual Dub or AmarecTV always capture at constant framerate.

The norm is to use those (VDub is my preference) into HUFFYUV or Lagarth compressed AVI, then import that into your video editor for the final output. Capturing into MP4 then editing that is not ideal (even without the variable framerate issue).
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  #3  
12-29-2020, 11:58 AM
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lordsmurf lordsmurf is offline
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Elgato Video Capture Card is not good.
Elgato software is even worse.
Lac of TBC causes dropped frames (and in turn sync issues). Some form of TBC is required.
Handbrake is not good.

The lack of sync is from the capture card, software, lack of TBC, or combo of all 3.
Handbrake it lousy, but not the cause here.

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